#include <iostream>
#include <algorithm>
#include <vector>

void solve() {
    std::vector<int> ls(3), ys(3);
    for (auto& l : ls) std::cin >> l;
    for (auto& y : ys) std::cin >> y;

    std::vector<int> xs(3);
    for (int i = 0; i < 3; ++i) {
        xs[i] = (ls[i] + ls[(i + 1) % 3]) * 2;
    }

    std::sort(xs.begin(), xs.end());
    std::sort(ys.rbegin(), ys.rend());

    int ans = 0;
    for (int i = 0; i < 3; ++i) {
        ans += xs[i] * ys[i];
    }

    std::cout << ans << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}